qwt3d display the number of every node in 3d surfaceplot

Hi!
I want to make a graph with some points in the 3d space.I want to display the number of every node in a 3d surfaceplot
I add the data with loadFromData(Qwt3D::TripleField,Qwt3D::CellField );
But i only get the lines(edges) in 3dspace how can i display also a number for every node?? the code that i use is